any force responsible for maintaining an object on a curved path around a fixed center. In introductory coursework this is usually "uniform circular motion" and yields several simple and useful relations. Not to be confused with the centrifugal pseudo-force experienced in a accelerated referenced ...

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29 views

Centripetal force and friction

Here is the question I need help on: A hemispherical pile of snow with a height of 20 m is piled up. An extreme skier starts at the top of this snowball, and she skies down finding that ...
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3answers
74 views

Centripetal and Centrifugal force

If water stays in a pail of water that is whirled around a circular path, the water stays in the pail. But is it because of centripetal force or inertia? I'm getting confused by all the different ...
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0answers
35 views

What are the conditions for the string of a pendulum to become slack? [on hold]

Suppose the bob of a stationary pendulum is given a sharp hit to impart it some horizontal speed. Now what are the conditions for the string to become slack after rotating a particular angle? ...
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2answers
40 views

Why is the centripetal force vector on a banked turn horizontal rather than parallel to the incline?

Why isn't the centripetal force parallel to the inclined surface? It seems like if you were to draw a circle with one point being at the center of the curve and one point at the car the circle would ...
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0answers
45 views

Gravity & centripetal force [closed]

Ok - My question rephrased, how are these three fundamental forces unified ? The Earth spins at a certain rate, it must follow that any object not attached must experience an out ward thrust. The ...
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1answer
61 views

What is $\omega \times v$?

I found that equation in my textbook. It says that $\omega \times v$ ($v$ is velocity) is centripetal acceleration. But how is the equation derived?
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2answers
79 views

Centripetal force: if radius decreases, does ANGULAR or TANGENTIAL velocity change?

Having conceptual trouble with this aspect of centripetal force. Say we have a puck on a frictionless table attached to a string that I am holding through a small hole, so that the puck moves in a ...
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1answer
60 views

Different forms of centripetal acceleration

For a circular motion centripetal acceleration can be expressed as $$a_{c}=\frac{v^2}{R} \hat{u_N}\tag{1}$$ Where $\hat{u_n}$ is the normal unit vector. Nevertheless in the expression for ...
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0answers
38 views

What does this sentence about centripetal force mean

I'm reading this paper about sensors and I came across this paragraph: In this paper, our objective is to enhance the area coverage of WMSNs by 1- turning sensors to the correct orientation and ...
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1answer
28 views

Circular motion on rotating body

Theory of circular motion is described at many references, such as https://en.wikipedia.org/wiki/Circular_motion. In this case, a body performs circular motion on a stationary path. For example, a car ...
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1answer
29 views

Why does the water in a bucket stay even when swung around in circular motion? [duplicate]

What are the force that act on the water and which force is responsible to keep the water from falling out?
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0answers
31 views

Centripetal acceleration in polar coordinates

$ \left( \ddot r - r\dot\varphi^2 \right) \hat{\mathbf r} + \left( r\ddot\varphi + 2\dot r \dot\varphi \right) \hat{\boldsymbol{\varphi}} \ $ I'm not convinced about the term $- r\dot\varphi^2 ...
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48 views

Centripetal force - uniform circular motion

I have done several different experiments with uniform circular motion. I have used this equation: $F=rm ({2\pi \over {T}})^2$. Here T is the time it takes the object to turn one circle. I have ...
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2answers
61 views

What is the power given by centripetal force?(in circular motion)

A particle of mass $m$ is moving in a circular path of constant radius such that the centripetal acceleration is varying with time as $a_c = k^2rt^2$ where $k$ is constant. The power given to ...
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4answers
204 views

Normal force on vertical circular motion

I have a couple of questions concerning vertical circular motion. The object shown in the diagram moves with constant speed on the inside of a circle. In point A the normal force points to the ...
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1answer
101 views

Final Velocity of an object on Parabolic Curve

I decided to participate in a school challenge involving launching a marble off a curved ramp from a given height and determining the distance the marble will travel. I can no longer participate, ...
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3answers
60 views

Net force for circular motion

So today my physics teacher was telling us that the net force when discussing circular motion was actually the centripetal force. He didn't go further and I would like to know if there's any proof to ...
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4answers
88 views

When is tension positive?

A 5kg mass is hanging from the roof of an elevator accelerating downward at a speed of 1.65 m/s^2 what is the tension of the string (ignore friction, string mass, and air resistance) ? I used this ...
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0answers
15 views

“Banking” a turn. calculating the force and direction to keep an object following a circular path

Say that I have a ball and i want it to follow a circular path. If it is traveling at velocity v how would I calculate the required force and direction of applied force to have it follow a specific ...
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0answers
22 views

rotating jars and centripetal force

why does water rise up the sides of a jars that are spun in a circle. How does the centripetal force act on the water making it move away from the center of the circle? Also how does speed affect the ...
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1answer
53 views

when does Newton's third law of motion come into effect

I'm a bit confused about when does Newton's third law come into effect and when it does not. For instance, lets say i was swinging a YoYo in a vertical circular motion, I would obviously have to ...
1
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2answers
74 views

Tension of a string rotating a ball in a circular motion?

A ball of mass 5kg is attached to a string of length 120 cm and rotating vertically at a speed of 10 cm/s. what is the tension of the string when the ball is farthest to the right from the ...
0
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4answers
99 views

When is the direction of the static friction negative?

i thought that the force of static friction exerted on an object is always going in the opposite direction of any other force exerted on the same object. however, this problem seems to disregard that ...
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2answers
72 views

What is total acceleration?

I'm currently taking a Physics class and we are studying motion in a circular path. and i'm kind of fuzzy on what the total acceleration actually is. take this problem for example An automobile ...
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3answers
76 views

Magnitude of Normal Force in Circular Motion

In the above diagram an object is in vertical circular motion. At $T_0$ the object is at pos1, and at that position, I have shown the forces resolved. So $F_n-mg\cos(a)$ is the centripetal force ...
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0answers
37 views

Centripetal Force Solving

I was recently learning about centripetal force when I came across a problem, I felt with my calculations. I re-watched the video, and the answer seems inadequate. The problem involves a bicyclist ...
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1answer
46 views

Solidifying understanding of centrifugal force at the equator vs poles

I'm just trying to get my head around the physics here and understand exactly what's going on, because there's a lot of conflicting information on the internet. Viewed from an inertial reference ...
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1answer
98 views

Normal Force in Circular Motion

In the above diagram, sec1(on the left side), an object of mass $m$, after releasing from rest from a slant track, continues into a vertical circular track. At a random position on the circular ...
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1answer
36 views

Why is the centripetal acceleration direction only correct for small velocity differences?

I was trying to make an image to show students how to get the direction of the centripetal acceleration from looking at the change in the velocity vectors in uniform circular motion. However, what I ...
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2answers
38 views

Conservation of energy in vertical circular motion

Books usually use conservation of energy to solve problems in vertical circular motion. But, principle of conservation of energy for one particle is, If all the $n$ forces $\vec F_i ...
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2answers
48 views

Magnitude of Tension: Circular Motion [closed]

Please consider the following: A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed. The ball has a mass m = 0.165 kg and moves at v = 4.76 m/s. The ...
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0answers
73 views

Centripetal force at the pole is different from the equator

why is the centripetal acceleration in the poles and equator if different? I know that it's related to Equatorial budge. But what I don't get it is that the centripetal force is zero at the poles. ...
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1answer
40 views

Which object fall from the spinning surface first [closed]

A layer of mud is placed on a plate. The plate is rotated and the mud near the edge will leave the plate first compare to the mud near the centre when angular speed of the plate is slowly increased. ...
1
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1answer
63 views

Generation of artificial gravity by rotation

I have been trying hard to understand how Artificial Gravity is produced by Rotating a satellite around its own axis. Thus far, I have understood (probably wrong) that as a satellite is spun, walls ...
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0answers
31 views

Centrifugal Force vs Motion (inertia)

Could centrifugal force be appropriately described as motion (inertia)--rather than an (imaginary) force? Could such a change of perspective eliminate much of the common confusion?
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4answers
2k views

Weightlessness in Satellites

The following is written in my textbook as the reason for weightlessness felt in satellites: The gravitational pull is counterbalanced by the centripetal force. This introduces two problems: ...
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2answers
47 views

Cause of centripetal acceleration in a ring

Suppose a ring is rotating in space with an angular velocity $\omega .$ Then each element of the ring is having an acceleration of $m\omega^2 r$ ($r$ is the radius of the ring) but what force is ...
1
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2answers
58 views

Period of mass in circular motion [closed]

I've been trying for 4 days now to solve my physics lab assignment but now I'm starting to think there must be a mistake in the question. You know those rotating mass experiments where you have a mass ...
1
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1answer
56 views

Why do we only feel the centrifugal force?

After spending some time researching about the centrifugal force, I now understand that it is needed in a non-inertial reference frame for Newton's Laws to hold true. However, I don't understand why ...
2
votes
2answers
69 views

Why doesn't a particle in uniform circular motion fall into the centre? [duplicate]

If a object is in uniform circular motion, I know there is a acceleration directed radially inward. If that's the case, shouldn't there be a velocity radially inwards at some time. If that's true. Why ...
0
votes
1answer
135 views

What force does balance centripetal force if centrifugal force doesn't exist in reality?

Which force does balance centripetal force? For example if we are rotating a ball tied with a string then centripetal force is acting inwards. Then which force balances it. I thought it is the ...
0
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1answer
39 views

How fast will a ball travel if spun around with a string then released? [closed]

It may seem like a stupid question, but I was wondering: If a ball with a mass of 50 kg was rotated from a string with a radius of 10m and a velocity of 100 m/s how fast will it be travelling when ...
3
votes
1answer
87 views

Is it possible to tell which way a Universe is spinning?

Imagine a Universe spinning on the x-axis. So there is a centripetal directed away from the x-axis. According to General Relativity this is entirely equivalent to a non-spinning Universe with a ...
-1
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1answer
32 views

How does static friction provide centripetal acceleration? [duplicate]

While reading about the motion of a car on a level road, I read that static friction provides centripetal acceleration? Please explain as simple as possible.
0
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2answers
49 views

Why do riders feel forced down into their seats at the bottom of the first drop on a rollercoaster?

I am trying to figure out what forces an $80.0kg$ rider travelling at $110.0km/h$ ($30.56m/s$) would experience when at the bottom of the first drop on a rollercoaster where the radius of the ...
0
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0answers
30 views

Storm in a teacup

The Beaufort scale defines storm as 24.5–28.4 m/s. Undoubtedly can you push air into a teacup at 26 m/s, but will anything (tea or otherwise) then remain in the teacup? In other words: Is it possible ...
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1answer
42 views

Centripetal Force [closed]

What is the size of the force required to cause a car of mass $1.75\times10^3$ kg to travel in constant circle of diameter $25.0\space m$ with a constant speed of $25.0 \space ms^{-1}$ ?
0
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2answers
65 views

Roller Coaster Physics

I am trying to figure out how to calculate the $g$-forces throughout a non-uniform corkscrew as well as the exiting velocity. Do you calculate each radius separately and each $g$-force separately ...
2
votes
2answers
107 views

How is direction of static friction not opposite in direction but perpendicular when dealing with centripetal forces?

I was trying to wrap my head around this solution, and the whole idea of a car moving around a level curve, how the friction supplies the centripetal force. But I still can't wrap my head around the ...
0
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0answers
112 views

Tension in a rod rotating about a fixed point

A rod of mass $m$ and length $l$ is rising about a fixed point in the ceiling with an angular velocity $\omega$ as shown in the figure. Now, on taking a small element on the rod, the net tension ...